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https://github.com/varun-r-mallya/sysprof.git
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1bd79af439
This provides a new sysprof-live-unwinder subprocess that runs as root to allow accessing all processes on the system via /proc/$pid/. It is spawned by sysprofd with various perf event FDs and a FD to write captures to. Ideally the capture_fd is something that will naturally error if the client application crashes (such as a socketpair() having the peer close). This is not enforced but encouraged. Additionally, an event_fd is used to allow the client application to signal the live-unwinder to exit. Unwinding is performed by looking at the modules loaded into the target pid and using libdwfl to access DWARF/CFI/etc state machinery. Stack data does not touch the disk as it exists in a mmap buffer from perf and is then translated into a callchain and sent to the Sysprof client. Unwinding occurs as normal post-mortem though is improved through the use of debuginfod to locate the appropriate symbols.
51 lines
2.4 KiB
C
51 lines
2.4 KiB
C
/*
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* sysprof-live-pid.h
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*
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* Copyright 2024 Christian Hergert <chergert@redhat.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: GPL-3.0-or-later
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*/
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#pragma once
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#include <glib.h>
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G_BEGIN_DECLS
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typedef struct _SysprofLiveProcess SysprofLiveProcess;
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SysprofLiveProcess *sysprof_live_process_new (GPid pid);
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SysprofLiveProcess *sysprof_live_process_ref (SysprofLiveProcess *self);
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void sysprof_live_process_unref (SysprofLiveProcess *self);
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gboolean sysprof_live_process_is_active (SysprofLiveProcess *self);
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void sysprof_live_process_add_map (SysprofLiveProcess *self,
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guint64 begin,
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guint64 end,
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guint64 offset,
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guint64 inode,
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const char *filename);
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guint sysprof_live_process_unwind (SysprofLiveProcess *self,
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GPid tid,
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guint64 abi,
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const guint8 *stack,
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gsize stack_len,
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const guint64 *registers,
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guint n_registers,
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guint64 *addresses,
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guint n_addresses);
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G_END_DECLS
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